package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.vo.OrderReportVO;
import com.sky.vo.SalesTop10ReportVO;
import com.sky.vo.TurnoverReportVO;
import com.sky.vo.UserReportVO;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private UserMapper userMapper;

    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> datalist = new ArrayList<LocalDate>();
        datalist.add(begin);
        while(!begin.equals(end)) {
            begin = begin.plusDays(1);
            datalist.add(begin);
        }
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : datalist) {
            //select sum(amount) from orders where order_time > ? and order_time < ? and status = 5
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap<>();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);

            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }
        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(datalist,","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }

    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> datalist = new ArrayList<LocalDate>();
        datalist.add(begin);
        while(!begin.equals(end)) {
            begin = begin.plusDays(1);
            datalist.add(begin);
        }
        List<Integer> newUserList = new ArrayList<>();
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : datalist) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap<>();

            map.put("end", endTime);
            Integer totalUser = userMapper.countByMap(map);
            totalUser = totalUser == null ? 0 : totalUser;
            totalUserList.add(totalUser);

            map.put("begin", beginTime);
            Integer newUser = userMapper.countByMap(map);
            newUser = newUser == null ? 0 : newUser;
            newUserList.add(newUser);


        }

        return UserReportVO
                .builder()
                .dateList(StringUtils.join(datalist,","))
                .newUserList(StringUtils.join(newUserList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .build();
    }

    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {

        List<LocalDate> datalist = new ArrayList<LocalDate>();
        datalist.add(begin);
        while(!begin.equals(end)) {
            begin = begin.plusDays(1);
            datalist.add(begin);
        }
        List<Integer> orderCountList = new ArrayList<>();
        List<Integer> validOrderList = new ArrayList<>();

        for (LocalDate date : datalist) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Integer orderCount = getOrderCount(beginTime, endTime, null);
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderList.add(validOrderCount);
        }
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        Integer validOrderCount = validOrderList.stream().reduce(Integer::sum).get();

        Double orderCompletionRage = 0.0;
        if (totalOrderCount != 0){
            orderCompletionRage = validOrderCount.doubleValue() / totalOrderCount.doubleValue();
        }

        return OrderReportVO.builder()
                .dateList(StringUtils.join(datalist, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCount(validOrderCount)
                .totalOrderCount(totalOrderCount)
                .validOrderCountList(StringUtils.join(validOrderList, ","))
                .orderCompletionRate(orderCompletionRage)
                .build();
    }

    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);

        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");

        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");
        return SalesTop10ReportVO
                .builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end, Integer status) {
        Map map = new HashMap<>();
        map.put("begin", begin);
        map.put("end", end);
        map.put("status", status);

        return orderMapper.countByMap(map);
    }
}
